Leather-working machine



Nov. 2 1926. 1,0s,z9o

G. A. SCHETTLER LEATHER WORKING MACHINE Filed Jun 15, 1925 2 Snets-Sheet 1 Nov. 2 1926; 1,605,290 1 G. A. SCH ETTLER LEATHER WORKING MACHINE Fi1ed.June 15, 1923 2 Sileets-Sheet' 2 Fig. 3. 15

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Patented Nov. 2, 1926. I

UNITED STATES tenant PATENT" OFFICE.

GUSTAV ADOLF SGI-IETTLEE, OF LEEDS, ENGLAND, ASSIGNOR TO THE TURNER TAN- NING MACHINERY COMPANY, OE'IPEABODY, MAINE, A CORPORATION OF MAINE.

r i LEATHER-WORKING MACHINE;

Application filed June .15, 1923, Serial No. 645,597, and in Great Britain June 20, 1922.

working machines a tool is supported for movement substantially. parallel to thew-ork bed and means are provided for reciprocat:

ing said tool to give successive strokes of the tool in contact with work such as hides or skins laid upon the bed to perform various operations such as glazing, ironing, setting out and the like.

In an arrangement of this sort wherein it may be desired to usea tool whoseoperating face has a substantial length along the path of movement, any tendency, however slight, for the forward end of the tool to bear heavier than the rear end of the tool would be detrimental in that the leather of the hide or skin would be wrinkled or otherwise pulled out of shape. Accordingly, an object of the invention is to provide an improved leather working machine of the type described in which the relative pressures of the ends of the tool may be controlled and the disadvantages noted may be avoided.

An important feature of the invention consists in an organization embodying a tool holder supported for movement substantially parallel to the work bed in which means are provided for adjusting supporting means for one end of the tool holder so as to insure that the pressure of the corresponding end of the tool on the work will not exceed that of the other end of the tool. As illustrated the pressure of one end of the tool may be made lighter than the pressure at the other end to allow a gradation of applied pressures as the tool progressively treats the work. Preferably, a compensating device is provided operating to allow the tool to yield in accordance with irregularities in the thickness or in the character of the work without materially affecting the relative pressures of the two ends of the tool.

In performing certain operations for which the invention is especially adapted, a plurality of tools are employed by mounting them upon a single. tool holder supported for movement substantially. parallel to the worksupporting bed and adjustable to vary the pressure of the tools on the work.

Preferably, the tool holder consists of a bar, link or other convenient member one glassing,

end of which is pivotally supported, as by a link, by a carrier bar having an endwise movement parallel to the table, while the other end is pivotally attached to a swinging head or bracket supported by the carrier bar'and actuated by. a connecting rod from a crank pin or equivalent.

In this arrangement the crank pin and connecting rod impart movement to the carrier bar and during the oscillation of the connecting rod the pivoted link and swing ing head keep the tool holder'parallel relatively to the carrier bar. i

As illustrated, the tool holder is attached to the swinging head by means of a spring controlled bell-crank lever in conjunction with which an adjustable stop is provided to regulate the front pressure of the tools on the work. An adjustable device is also provided to regulatethe action of the spring controlling the bell-crank lever which lever and spring serve as a compensating means for irregularities in the substance of the work. i

In order that my invention and the applicationof'the same maybe clearly understood reference will now be made to the accompanying drawings in which Fig. l is a side view of a leather working machine having a practical example of tlr; invention applied thereto;

Fig. 2 is a detail side view, on a larger scale, of the swinging head showing an ironing tool attached; 1

Fig. 3 is a side elevation of a setting-out tool;

, Fig. 4 is a plan of the same; Fig. 5 is a side elevation of a glazing tool; Fig. 6 is a plan of the same, and Fig. 7 is a perspective viewof the machine viewed from the other side.

The machine illustrated as embodying the present invention comprises a framework 20 made up of similar spaced parallel members, as shown in Fig. 7, having overhanging ends 22 which in turn support upstanding members 24. At the lower part of the frame, there is provided a flat Work supporting bed 26 across which the piece of leather is adjusted from time to time by the operator to present various parts to the action of the tool.

. The tool carrying mechanism comprises a tool holder 7 constructed and arranged for movement parallel to the work supporting bed 26. Tothis end the outer end of the tool holder 7 is pivotally connected by a link 9 to the outer end of a carrier bar 1. The outer end of the carrier bar 1 is pivotally attached at the point to the lower end of a pendulum lever 2 fulcrumed near its center upon similar links 28 which are pivotally supported by the front ends of the overhanging frame members 22. A link 80 connects the upper end of the pendulum 2 with the upstanding frame members The inner end of the carrier bar 1 is supported and guided by a pair of rolls 3 pivoted to one of the frame members 22.

The inner or front end of the tool holder 7 is pivotally connected to one arm 6 of a bell crank 6 mounted on a swinging head l which in turn is pivotally attached to the carrier bar 1 at the point l. The swinging head at is carried at one end of a connecting rod or pitman 5 which is actuated by a crank pin 11 mounted on a driving wheel 12 rotatably supported between the two frame members 22. I

The described mechanism for supporting the tool holder 7 provides a parallel motion arrangement of known form which, in con nection with the link 9 on the one hand and the bell crank arm 6 and swinging head t on the other hand, imparts to the tool holder a substantially straight line movement approximately parallel to the work supporting surface of the bed 26 while the pitman 5 and crank pin 11 constitute connections to a source of power for effecting operating movement of the tool holder 7. The carrier bar 1 extends along one side of the lower end of the pendulum 2 and a link 10 also pivoted at the point 32 on the pendulum is pivotally connected to the link 9 and the swinging head 4 to provide a more substantial construction.

Embodied in the swinging head l is an arrangement for limiting the approach of one end of the tool carrier to the work which may be adjustable so as to insure against excessive pressure of the front end of a tool. such as the ironing tool 7 upon the work.

If desired the pressure of the front end ofthe tool 7 may be made less than that of its rear end. To secure this result the bell crank lever 6 is pivoted to the swinging head 4: at l and has an upstanding arm 6 Adjustment of the position of the bell crank lever with respect to the swinging head is so cured by means of a stop screw d bearing against one side of the arm 6 of the bell crank lever 6. The arm (i is resiliently held in contact with the adj list-able stop 4 by means of a spring 8 the tension of which may be adjusted by means of a screw 8' threaded in said head. The arrangement described, therefore, not only provides an adjustment for the forward end of the tool carrier but also urges said tool carrier resili- 'ness of the work.

In the embodiment shown in Figs. 1 and 2 the tool holder 7 is shown fitted with a plate device 7 for ironing purposes this being heated by suitable electrical means the connection for which is represented at 7" and a controlling switch at 7 (Fig. 1).

The holder 7 is interchangeable with others having different tools, for which purpose it is attached in a removable manner to the link 9 and bell-crank lever (5 by means of pins 13 by removal of which it can be detached from said carrying members and be replaced by another such as those illustrated in Figs. 3 to 6 which holders are equipped with a plurality of tools or operating devices adapted to be used at the same time upon the material. In the form shown in Figs. 3 and 4 the holder 7, which is adapted to be fitted to the members 6 and 9 by the pins 13, is provided on its under side with a plurality of V-shaped blades 1% arranged one behind another suitable for performing the operation of setting out. in the form shown in Figs. 5 and 6, the holder 7 has a tached to it three glass cylinders 15 fixed one behind another and adapted for glazing, glassing and like operations. By means of a similar removable holder other tools such. for example as for slicking and other operations may be applied in the same manner.

It will be understood that in the stop screw 4 either alone or in conjunction with the adjust-ably tensioned spring 8, a single means is provided for varying the pressures applied by the tools to the work and that the pressures vary in degree with the distances of the tools froin the point of pivotal mounting of the tool holder. Hence when it is desirable under certain conditions that the first or front-end tool should operate at a lighter pressure than the rear-end tool, the illustrated construction provides for a graduated application of pressure from front to rear of the line of tools on the work.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. In a leather working machine, a flat work-supporting bed, a tool holder supported for movement substantially parallel to the bed. means for reciprocating the tool holder back and forth over the bed, and a plurality of workengaging tools carried by the tool holder and extending one after another along the path. of reciprocation of the tool holder successively to engage work on the bed, said tool holder being adjustable to vary the pressure of the tools on the work.

2. In a leather working machine, a worksupporting bed, a tool holder, a tool carried thereby, means for supporting said tool holder for movement substantially parallel to said bed, actuating means arranged to reciprocate said tool holder with the tool in contact with the work upon the supporting bed, means for adjusting one end of the tool holder arrangedto limit its approach toward the work thereby varyingthe pressure of the corresponding end of the tool upon the work, and resilient compensating means urging the adjustable end of the tool holder toward its limit of approach toward the work to permit the tool to yield in accordance with irregularities in the work.

3. In a leather working machine, a worksupporting bed, a carrier bar, means for supporting said bar for movement substantially parallel to said bed, a tool holder, a tool carried on said tool holder, connecting means supporting said tool holder from said carrierbar for movement parallel thereto, actuating means arranged to move the tool longitudinally of the bed, and means to adjust said connecting means to enable the tool to operate with a pressure lighter at its front end than that at its back end.

4. In a leather working machine, a worksupporting bed, a tool holder. a tool carried thereby, means for supporting said tool holder for movement substantially parallel to said bed, actuating means arranged to reciprocate said tool holder with the tool in contact with the work upon the supporting bed, and means for adjusting the pressure of one end of said tool upon the work relative to the pressure of the other end of the tool.

5. In a leather working machine, a worksupporting bed, a tool holder, a plurality 0t tools carried by said holder extendingone after another along the path of movement of the tool holder, means for supporting said tool holder for movement substantially parallel to said bed, actuating means arranged to reciprocate said tool holder with the tools in contact with the work upon the supporting bed, and a single means for varying the pressures applied by all or: said tools to the work.

6. In a leather working machine, a worksupporting bed, a carrier bar, means for supporting said bar for movement substanti ally parallel to said bed, a tool holder, a tool carried on said tool holder, means comprising links for operatively connecting said tool holder to said carrier bar for movement parallel thereto, actuating means arran ed to move the tool longitudinally of the bed including a connecting rod joined to said connecting means, said connecting means being adjustable to determine the limit of approach of one end of the tool toward the work, and resilient means urging said connecting means into its limiting position.

7. In a leather working machine, a flat work-supporting bed, a toolholder, a tool carried thereby provided with an extended work engaging surface having a plurality of points of contact with the work, means for supporting said tool holder for movement substantially parallel to the bed, means for moving the supporting means to carry the tool along the work supported on the bed, said tool holder supporting means including a bell crank lever having one arm pivotally .connected at one end to one end of the tool holder, a stop engaging one side of the other arm of said lever, and a spring engaging the other side of said latter arm of the lever whereby the limit of approach of one end of the tool holder with respect to the work Is determined and the tool holder is resiliently urged toward said limiting position.

8. In a leather working machine, a tool hold-er supported for movement substantially parallel to the work, means for reciprocating said tool holder, a plurality otwork-engagtools supported on said tool holder distributed in the direction of movement of the tool holder successively to engage the work, and means for angularly adjusting the position of the tool holder to vary the pressures exerted by the successive tools relative to each other upon the work.

9. In a leather working machine, a work supporting bed, tool holder, a plurality of tools carried by said holder, means for supporting said tool holder for movement substantially parallel to said bed, actuating means arranged to reciprocate said tool holder to cause the tools to operate upon the work on the supporting bed, and means for adjusting the tool holder to vary the pressure exerted by each of the tools upon the work.

10. In a leather working machine, a work supporting bed, a tool holder, a plurality of tools carried by said holder and extending in a line one after another along the path of movement of the tool holder, means for supporting said tool holder for movement substantially parallel to said bed, actuating means arranged to reciprocate said tool holder to cause the tools to operate upon the work on the supporting bed, and a single means for effecting a graduated variation in the pressures applied by the tools on the work.

In testimony whereof I have signed my name to this specification.

GUSTAV ADOLF SGI'IETTLER. 

